package com.demo.websocket;

import cn.hutool.log.Log;
import cn.hutool.log.LogFactory;
import jakarta.websocket.*;
import jakarta.websocket.server.PathParam;
import jakarta.websocket.server.ServerEndpoint;
import org.springframework.stereotype.Component;

import java.io.IOException;
import java.util.concurrent.CopyOnWriteArraySet;

@Component
@ServerEndpoint(value = "/websocket/{userId}")
public class WebSocketServer {
    static Log log= LogFactory.get(WebSocketServer.class);
    /**
     * 静态变量，用来记录当前在线连接数。应该把它设计成线程安全的。
     */
    private static int onlineCount = 0;
    /**
     * concurrent包的线程安全Set，用来存放每个客户端对应的MyWebSocket对象。
     */
    private static CopyOnWriteArraySet<WebSocketServer> webSocketSet = new CopyOnWriteArraySet<WebSocketServer>();

    /**
     * 与某个客户端的连接会话，需要通过它来给客户端发送数据
     */
    private Session session;

    /**
     * 接收userId
     */
    private Long userId;

    MyThread thread1=new MyThread();

    Thread thread=new Thread(thread1);//用来存放每个客户端对应的MyWebSocket对象。

    /**
     * 连接建立成功调用的方法*/
    @OnOpen
    public void onOpen(Session session,@PathParam("userId") Long userId) {
        thread1.setUserId(userId);
        this.session = session;
        //加入set中
        webSocketSet.add(this);
        thread.start();
        //在线数加1
        addOnlineCount();
        log.info("有新窗口开始监听:"+userId+",当前在线人数为" + getOnlineCount());
        this.userId=userId;
        try {
            sendMessage("连接成功");
        } catch (IOException e) {
            log.error("websocket IO异常");
        }
    }

    /**
     * 连接关闭调用的方法
     */
    @OnClose
    public void onClose() {
        thread1.stopMe();
        webSocketSet.remove(this);
        subOnlineCount();
        log.info("有一连接关闭！当前在线人数为" + getOnlineCount());
    }

    /**
     * 收到客户端消息后调用的方法
     *
     * @param message 客户端发送过来的消息*/
    @OnMessage
    public void onMessage(String message, Session session) {
        log.info("收到来自窗口"+userId+"的信息:"+message);
        for (WebSocketServer item : webSocketSet) {
            try {
                item.sendMessage(message);
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

    /**
     *
     * @param session
     * @param error
     */
    @OnError
    public void onError(Session session, Throwable error) {
        log.error("发生错误");
        error.printStackTrace();
    }
    /**
     * 实现服务器主动推送
     */
    public void sendMessage(String message) throws IOException {
        this.session.getBasicRemote().sendText(message);
    }


    /**
     * 群发自定义消息
     * */
    public static void sendInfo(String message,@PathParam("userId") Long userId) throws IOException {
        log.info("推送消息到窗口"+userId+"，推送内容:"+message);
        for (WebSocketServer item : webSocketSet) {
            try {
                if(userId==null) {
                    return;
                }else if(item.userId.equals(userId)){
                    item.sendMessage(message);
                }
            } catch (IOException e) {
                continue;
            }
        }
    }

    public static synchronized int getOnlineCount() {
        return onlineCount;
    }

    public static synchronized void addOnlineCount() {
        WebSocketServer.onlineCount++;
    }

    public static synchronized void subOnlineCount() {
        WebSocketServer.onlineCount--;
    }
}
